<template>
  <div class='login_container'>
    <div class="background">
      <img :src="imgSrc" width="100%" height="100%" alt="" />
    </div>
    <div class='login_box'>
      <!-- 头像区域 -->
      <div class='avatar_box'>
        <img src="../assets/logo.png" alt="logo">
      </div>
      <!-- 登录表单区域 -->
      <!-- 这里的loginFormRef就是表单的（引用）实例对象，可以通过实例对象调用表单的方法 -->
      <el-form ref='loginFormRef' :model="loginForm" :rules="loginFormRules" label-width="0px" class='login_form'>
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model='loginForm.username' prefix-icon="iconfont el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop='password'>
          <el-input  v-model='loginForm.password' prefix-icon="iconfont el-icon-unlock" type='password'></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class='btns'>
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginFrom">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
import {Message} from 'element-ui';
export default {
  name: "Login",
  data() {
    return{
      // imgSrc:require('../assets/bk.jpg'),
      imgSrc:'https://cdn.jsdelivr.net/gh/LiYuXii/images/2.jpg',
      loginForm:{
        username: '',
        password: ''
      },
      // 表单验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 20, message: '长度在 3 到 20 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods:{
    // 点击重置按钮，重置登录表单
    resetLoginFrom () {
      // 找到$refs对象的loginFormRef属性，并调用重置resetFields()方法
      this.$refs.loginFormRef.resetFields()
    },
    login(){
      this.$http.post('/student/user/login',this.loginForm).then((res) => {
        console.log(res.data.data);
        if (res.data.flag){
          this.$router.push('/stu');
          Message.success(res.data.message)
        }else {
          Message.error(res.data.message)
        }
      })
    }
  },
}
</script>

<style scoped>
.login_container{
  background-image: url('../assets/bk.jpg');
  background-repeat: no-repeat;
  background-size:100%;
  background-position: 0px -50px;
  height: 100%;
}
.login_box{
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  /* 透明度设置 */
  opacity: 0.9;
  filter:alpha(opacity=90);
}
.login_box .avatar_box{
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 5px #ddd;
  position: absolute;
  left: 50%;
  /* 让盒子在页面垂直居中显示 */
  transform: translate(-50%, -50%);
  background-color: #fff;
}
.login_box .avatar_box img{
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.login_form{
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  /* 设置为以前的IE盒子 */
  box-sizing: border-box;
}
.btns{
  display: flex;
  /* 尾部对齐 */
  justify-content: center;

}
</style>
